Global Patent Index - EP 0977028 A4

EP 0977028 A4 2001-05-23 - METHOD OF SPECTROCHEMICAL ANALYSIS OF IMPURITY IN GAS

Title (en)

METHOD OF SPECTROCHEMICAL ANALYSIS OF IMPURITY IN GAS

Title (de)

VERFAHREN ZUR SPEKTROCHEMISCHEN ANALYSE VON VERUNREINIGUNGEN IN GAS

Title (fr)

PROCEDE D'ANALYSE SPECTRALE D'IMPURETES DANS UN GAZ

Publication

EP 0977028 A4 (EN)

Application

EP 99901876 A

Priority

  • JP 9900323 W
  • JP 1620198 A

Abstract (en)

[origin: WO9939188A1] An absorption spectrochemical analysis using frequency-modulated laser produced by a semiconductor laser device. To measure absorption spectra, the semiconductor laser device is operated by injection current in a range between the lower limit (B) where the change in laser intensity as the increase in injection current becomes close to a minimum and the higher limit (C) where the change in laser wavelength as the increase in injection current becomes close to a minimum. This method allows minute impurity in gas to be measured with high sensitivity and accuracy.

IPC 1-7 (main, further and additional classification)

G01N 21/39

IPC 8 full level (invention and additional information)

G01N 21/39 (2006.01); H01S 5/06 (2006.01)

CPC (invention and additional information)

G01N 21/39 (2013.01); G01N 2021/391 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

WO 9939188 A1 19990805; EP 0977028 A1 20000202; EP 0977028 A4 20010523; JP H11211658 A 19990806; KR 100316487 B1 20011212; KR 20010005783 A 20010115; TW 448291 B 20010801

INPADOC legal status


2005-02-02 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20040803

2001-05-23 [A4] DESPATCH OF SUPPLEMENTARY SEARCH REPORT

- Effective date: 20010411

2001-05-23 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): DE FR GB IT NL

2000-02-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991001

2000-02-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT NL